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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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TV with weak colour
I have a late '80s vintage Philips CP110 Tv , which works well, but
the colour is weak, even with the saturation control set to full the picture is only just more 'colourful' than B&W! .. is this likely to be something like a low voltage to the RGB stage,or something more serious? -B |
#2
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TV with weak colour
In article
, b wrote: I have a late '80s vintage Philips CP110 Tv , which works well, but the colour is weak, even with the saturation control set to full the picture is only just more 'colourful' than B&W! . is this likely to be something like a low voltage to the RGB stage,or something more serious? What happens if you drive it with an RGB signal? -- *Always borrow money from pessimists - they don't expect it back * Dave Plowman London SW To e-mail, change noise into sound. |
#3
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TV with weak colour
"b" wrote in message ... I have a late '80s vintage Philips CP110 Tv , which works well, but the colour is weak, even with the saturation control set to full the picture is only just more 'colourful' than B&W! . is this likely to be something like a low voltage to the RGB stage,or something more serious? -B If the A1 control is set wrongly, some of the older CRT types can look 'washed out'. Sometimes, beam limiter problems can give the same effect. A fault in the ACC circuitry will do it, and sometimes, a mishapen sandcastle pulse, which used to be quite common back then. Often down to a resistor in the HOP stage, where the pulse is 'constructed', having gone high. Arfa |
#4
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TV with weak colour
On 30 dic 2008, 15:46, "Arfa Daily" wrote:
"b" wrote in message ... I have a late '80s vintage Philips CP110 Tv , which works well, but the colour is weak, even with the saturation control set to full the picture is only just more 'colourful' than B&W! . is this likely to be something like a low voltage to the RGB stage,or something more serious? -B If the A1 control is set wrongly, some of the older CRT types can look 'washed out'. Sometimes, beam limiter problems can give the same effect. A fault in the ACC circuitry will do it, and sometimes, a mishapen sandcastle pulse, which used to be quite common back then. Often down to a resistor in the HOP stage, where the pulse is 'constructed', having gone high. Arfa I finally dug this set out again today and it did seem as if the G2 was a bit high, so I lowered the SCREEN control slightly on the Line o/ p tranny and that gave a far more natural colour. Haven't tried it with RGB source, as didn't have one to hand. set seems fine now , cheers, B. |
#5
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TV with weak colour
"b" wrote in message ... On 30 dic 2008, 15:46, "Arfa Daily" wrote: "b" wrote in message ... I have a late '80s vintage Philips CP110 Tv , which works well, but the colour is weak, even with the saturation control set to full the picture is only just more 'colourful' than B&W! . is this likely to be something like a low voltage to the RGB stage,or something more serious? -B If the A1 control is set wrongly, some of the older CRT types can look 'washed out'. Sometimes, beam limiter problems can give the same effect. A fault in the ACC circuitry will do it, and sometimes, a mishapen sandcastle pulse, which used to be quite common back then. Often down to a resistor in the HOP stage, where the pulse is 'constructed', having gone high. Arfa I finally dug this set out again today and it did seem as if the G2 was a bit high, so I lowered the SCREEN control slightly on the Line o/ p tranny and that gave a far more natural colour. Haven't tried it with RGB source, as didn't have one to hand. set seems fine now , cheers, B. I'm not familiar with the model - and slightly out of touch with TVs in general - but having considerable experience in TV service in the distant past, I can tell you that colour saturation has nothing to do with A1 or A2 controls - which only affect brightness or 'grey-scale' settings. Look for the chrominance amplifier circuitry, that is where the problem is likely to be. |
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